content: /*
   * Copyright 2016-present David Karnok
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package hu.akarnokd.rxjava3.math;
  
  import java.util.Comparator;
  
  import hu.akarnokd.rxjava3.util.SelfComparator;
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.plugins.RxJavaPlugins;
  
  /**
   * Utility methods to work with numerical Observable sources: sum, min, max and average.
   */
  public final class MathObservable {
      /** Utility class. */
      private MathObservable() {
          throw new IllegalStateException("No instances!");
      }
  
      public static Observable<Integer> sumInt(ObservableSource<Integer> source) {
          return RxJavaPlugins.onAssembly(new ObservableSumInt(source));
      }
  
      public static Observable<Long> sumLong(ObservableSource<Long> source) {
          return RxJavaPlugins.onAssembly(new ObservableSumLong(source));
      }
  
      public static Observable<Float> sumFloat(ObservableSource<Float> source) {
          return RxJavaPlugins.onAssembly(new ObservableSumFloat(source));
      }
  
      public static Observable<Double> sumDouble(ObservableSource<Double> source) {
          return RxJavaPlugins.onAssembly(new ObservableSumDouble(source));
      }
  
      public static <T extends Comparable<? super T>> Observable<T> max(ObservableSource<T> source) {
          Comparator<T> comp = SelfComparator.instance();
          return max(source, comp);
      }
  
      public static <T> Observable<T> max(ObservableSource<T> source, Comparator<? super T> comparator) {
          return RxJavaPlugins.onAssembly(new ObservableMinMax<>(source, comparator, -1));
      }
  
      public static <T extends Comparable<? super T>> Observable<T> min(ObservableSource<T> source) {
          Comparator<T> comp = SelfComparator.instance();
          return min(source, comp);
      }
  
      public static <T> Observable<T> min(ObservableSource<T> source, Comparator<? super T> comparator) {
          return RxJavaPlugins.onAssembly(new ObservableMinMax<>(source, comparator, 1));
      }
  
      @SuppressWarnings("unchecked")
      public static Observable<Float> averageFloat(ObservableSource<? extends Number> source) {
          return RxJavaPlugins.onAssembly(new ObservableAverageFloat((ObservableSource<Number>)source));
      }
  
      @SuppressWarnings("unchecked")
      public static Observable<Double> averageDouble(ObservableSource<? extends Number> source) {
          return RxJavaPlugins.onAssembly(new ObservableAverageDouble((ObservableSource<Number>)source));
      }
  
  }
  